Nordic stack and drivers for the mbed BLE API
Dependents: BLE_ANCS_SDAPI BLE_temperature BLE_HeartRate writable_gatt ... more
Diff: TARGET_MCU_NRF51822/sdk/source/libraries/bootloader_dfu/bootloader_util.c
- Revision:
- 638:c90ae1400bf2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TARGET_MCU_NRF51822/sdk/source/libraries/bootloader_dfu/bootloader_util.c Wed Sep 14 14:39:43 2016 +0100 @@ -0,0 +1,172 @@ +/* + * Copyright (c) Nordic Semiconductor ASA + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, this + * list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of other + * contributors to this software may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include "bootloader_util.h" +#include <stdint.h> +#include <string.h> + + +/** + * @brief Function for aborting current application/bootloader jump to to other app/bootloader. + * + * @details This functions will use the address provide to swap the stack pointer and then load + * the address of the reset handler to be executed. It will check current system mode + * (thread/handler) and if in thread mode it will reset into other application. + * If in handler mode \ref isr_abort will be executed to ensure correct exit of handler + * mode and jump into reset handler of other application. + * + * @param[in] start_addr Start address of other application. This address must point to the + initial stack pointer of the application. + * + * @note This function will never return but issue a reset into provided application. + */ +#if defined ( __CC_ARM ) +__asm static void bootloader_util_reset(uint32_t start_addr) +{ + LDR R5, [R0] ; Get App initial MSP for bootloader. + MSR MSP, R5 ; Set the main stack pointer to the applications MSP. + LDR R0, [R0, #0x04] ; Load Reset handler into R0. This will be first argument to branch instruction (BX). + + MOVS R4, #0xFF ; Load ones to R4. + SXTB R4, R4 ; Sign extend R4 to obtain 0xFFFFFFFF instead of 0xFF. + MRS R5, IPSR ; Load IPSR to R5 to check for handler or thread mode. + CMP R5, #0x00 ; Compare, if 0 then we are in thread mode and can continue to reset handler of bootloader. + BNE isr_abort ; If not zero we need to exit current ISR and jump to reset handler of bootloader. + + MOV LR, R4 ; Clear the link register and set to ones to ensure no return, R4 = 0xFFFFFFFF. + BX R0 ; Branch to reset handler of bootloader. + +isr_abort + ; R4 contains ones from line above. Will be popped as R12 when exiting ISR (Cleaning up the registers). + MOV R5, R4 ; Fill with ones before jumping to reset handling. We be popped as LR when exiting ISR. Ensures no return to application. + MOV R6, R0 ; Move address of reset handler to R6. Will be popped as PC when exiting ISR. Ensures the reset handler will be executed when exist ISR. + MOVS r7, #0x21 ; Move MSB reset value of xPSR to R7. Will be popped as xPSR when exiting ISR. xPSR is 0x21000000 thus MSB is 0x21. + REV r7, r7 ; Reverse byte order to put 0x21 as MSB. + PUSH {r4-r7} ; Push everything to new stack to allow interrupt handler to fetch it on exiting the ISR. + + MOVS R4, #0x00 ; Fill with zeros before jumping to reset handling. We be popped as R0 when exiting ISR (Cleaning up of the registers). + MOVS R5, #0x00 ; Fill with zeros before jumping to reset handling. We be popped as R1 when exiting ISR (Cleaning up of the registers). + MOVS R6, #0x00 ; Fill with zeros before jumping to reset handling. We be popped as R2 when exiting ISR (Cleaning up of the registers). + MOVS R7, #0x00 ; Fill with zeros before jumping to reset handling. We be popped as R3 when exiting ISR (Cleaning up of the registers). + PUSH {r4-r7} ; Push zeros (R4-R7) to stack to prepare for exiting the interrupt routine. + + MOVS R0, #0xF9 ; Move the execution return command into register, 0xFFFFFFF9. + SXTB R0, R0 ; Sign extend R0 to obtain 0xFFFFFFF9 instead of 0xF9. + BX R0 ; No return - Handler mode will be exited. Stack will be popped and execution will continue in reset handler initializing other application. + ALIGN +} +#elif defined ( __GNUC__ ) +static inline void bootloader_util_reset(uint32_t start_addr) +{ + __asm volatile( + "ldr r0, [%0]\t\n" // Get App initial MSP for bootloader. + "msr msp, r0\t\n" // Set the main stack pointer to the applications MSP. + "ldr r0, [%0, #0x04]\t\n" // Load Reset handler into R0. + + "movs r4, #0xFF\t\n" // Move ones to R4. + "sxtb r4, r4\t\n" // Sign extend R4 to obtain 0xFFFFFFFF instead of 0xFF. + + "mrs r5, IPSR\t\n" // Load IPSR to R5 to check for handler or thread mode. + "cmp r5, #0x00\t\n" // Compare, if 0 then we are in thread mode and can continue to reset handler of bootloader. + "bne isr_abort\t\n" // If not zero we need to exit current ISR and jump to reset handler of bootloader. + + "mov lr, r4\t\n" // Clear the link register and set to ones to ensure no return. + "bx r0\t\n" // Branch to reset handler of bootloader. + + "isr_abort: \t\n" + + "mov r5, r4\t\n" // Fill with ones before jumping to reset handling. Will be popped as LR when exiting ISR. Ensures no return to application. + "mov r6, r0\t\n" // Move address of reset handler to R6. Will be popped as PC when exiting ISR. Ensures the reset handler will be executed when exist ISR. + "movs r7, #0x21\t\n" // Move MSB reset value of xPSR to R7. Will be popped as xPSR when exiting ISR. xPSR is 0x21000000 thus MSB is 0x21. + "rev r7, r7\t\n" // Reverse byte order to put 0x21 as MSB. + "push {r4-r7}\t\n" // Push everything to new stack to allow interrupt handler to fetch it on exiting the ISR. + + "movs r4, #0x00\t\n" // Fill with zeros before jumping to reset handling. We be popped as R0 when exiting ISR (Cleaning up of the registers). + "movs r5, #0x00\t\n" // Fill with zeros before jumping to reset handling. We be popped as R1 when exiting ISR (Cleaning up of the registers). + "movs r6, #0x00\t\n" // Fill with zeros before jumping to reset handling. We be popped as R2 when exiting ISR (Cleaning up of the registers). + "movs r7, #0x00\t\n" // Fill with zeros before jumping to reset handling. We be popped as R3 when exiting ISR (Cleaning up of the registers). + "push {r4-r7}\t\n" // Push zeros (R4-R7) to stack to prepare for exiting the interrupt routine. + + "movs r0, #0xF9\t\n" // Move the execution return command into register, 0xFFFFFFF9. + "sxtb r0, r0\t\n" // Sign extend R0 to obtain 0xFFFFFFF9 instead of 0xF9. + "bx r0\t\n" // No return - Handler mode will be exited. Stack will be popped and execution will continue in reset handler initializing other application. + ".align\t\n" + :: "r" (start_addr) // Argument list for the gcc assembly. start_addr is %0. + : "r0", "r4", "r5", "r6", "r7" // List of register maintained manually. + ); +} +#elif defined ( __ICCARM__ ) +static inline void bootloader_util_reset(uint32_t start_addr) +{ + asm("ldr r5, [%0]\n" // Get App initial MSP for bootloader. + "msr msp, r5\n" // Set the main stack pointer to the applications MSP. + "ldr r0, [%0, #0x04]\n" // Load Reset handler into R0. + + "movs r4, #0x00\n" // Load zero into R4. + "mvns r4, r4\n" // Invert R4 to ensure it contain ones. + + "mrs r5, IPSR\n" // Load IPSR to R5 to check for handler or thread mode + "cmp r5, #0x00\n" // Compare, if 0 then we are in thread mode and can continue to reset handler of bootloader. + "bne isr_abort\n" // If not zero we need to exit current ISR and jump to reset handler of bootloader. + + "mov lr, r4\n" // Clear the link register and set to ones to ensure no return. + "bx r0\n" // Branch to reset handler of bootloader. + + "isr_abort: \n" + // R4 contains ones from line above. We be popped as R12 when exiting ISR (Cleaning up the registers). + "mov r5, r4\n" // Fill with ones before jumping to reset handling. Will be popped as LR when exiting ISR. Ensures no return to application. + "mov r6, r0\n" // Move address of reset handler to R6. Will be popped as PC when exiting ISR. Ensures the reset handler will be executed when exist ISR. + "movs r7, #0x21\n" // Move MSB reset value of xPSR to R7. Will be popped as xPSR when exiting ISR. xPSR is 0x21000000 thus MSB is 0x21. + "rev r7, r7\n" // Reverse byte order to put 0x21 as MSB. + "push {r4-r7}\n" // Push everything to new stack to allow interrupt handler to fetch it on exiting the ISR. + + "movs r4, #0x00\n" // Fill with zeros before jumping to reset handling. We be popped as R0 when exiting ISR (Cleaning up of the registers). + "movs r5, #0x00\n" // Fill with zeros before jumping to reset handling. We be popped as R1 when exiting ISR (Cleaning up of the registers). + "movs r6, #0x00\n" // Fill with zeros before jumping to reset handling. We be popped as R2 when exiting ISR (Cleaning up of the registers). + "movs r7, #0x00\n" // Fill with zeros before jumping to reset handling. We be popped as R3 when exiting ISR (Cleaning up of the registers). + "push {r4-r7}\n" // Push zeros (R4-R7) to stack to prepare for exiting the interrupt routine. + + "movs r0, #0x06\n" // Load 0x06 into R6 to prepare for exec return command. + "mvns r0, r0\n" // Invert 0x06 to obtain EXEC_RETURN, 0xFFFFFFF9. + "bx r0\n" // No return - Handler mode will be exited. Stack will be popped and execution will continue in reset handler initializing other application. + :: "r" (start_addr) // Argument list for the IAR assembly. start_addr is %0. + : "r0", "r4", "r5", "r6", "r7"); // List of register maintained manually. +} +#else +#error Compiler not supported. +#endif + + +void bootloader_util_app_start(uint32_t start_addr) +{ + bootloader_util_reset(start_addr); +}